score:0

you need to have charts as separate entities:

// put all the instances of chart into a single array
let charts = [chart1, chart2, ... ]

// when the data comes back, do the following:
let data = [80, 70, ... ] // example data

data.map((value, index) => {
   let chart = charts[index];
   // assign data to chart
   chart.data = value;
})

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